The numbers may not be adding up for the ongoing relationship between the Windham school district and Norwich Free Academy.

John French, chairman of the Windham Board of Education's finance subcommittee, said his committee likely will bring forward a resolution to stop sending Windham students to NFA. The district has an agreement with NFA to send up to 10 students a year, and there are 20 students from Windham attending the school now.

"We're probably in favor of not continuing the contract with NFA," French said. "We will bring it forward to the entire board in January."

Tuition at NFA is $11,450 this year, and the the NFA board of trustees recently voted for a 4 percent tuition hike in each of the next three years, said Windham Superintendent Ana Ortiz.

French said in the 2016-17 school year, when Windham will have 41 students at NFA, the estimated cost is $528,000 for the year.

Windham school board member Murphy Sewall said he wants to know how much more that is compared to the cost of educating the students in district.

NFA says the costs of sending students from Windham to the academy is not prohibitive.

Citing state numbers, Geoffrey Serra, director of communications and public affairs at NFA, said the average per-pupil costs for Windham to educate students in in 2010-11 was $17,257. Serra said using that number, it cost Windham $707,537 to educate 41 students at its own high school in 2010-11, which is $179,537 more than the projected cost of an NFA education for 41 students in 2016-17.

"We understand and respect the fiscal concerns of the chairman of the Windham Board of Education's finance subcommittee and extend our earlier offer to make a public presentation to the board to clarify the value and cost (of) the NFA experience," Serra said.

Windham's own per-pupil cost figure comes in at less than $10,000, but that number is the cost of all academic spending and does not factor in facility costs.

French said those facility costs don't change in Windham because 41 students are being educated at NFA.

NFA is a quasi-private school with a board of trustees that sets the school's budget and tuition rates. However, it is the public high school for Norwich and many other surrounding municipalities. Windham is the only district partnering with NFA that has its own high school.

Windham middle school student Nathan Perez Espita recently said that more than 100 of his fellow students attended an NFA open house. Espita said he was hoping to be one of the 10 students who won a spot at NFA.